M1 Carbine Part 6: Component markings and manufacturers

I know that this has been a long time coming and we’ve still got a long way to go; we’ve still got to reassemble everything, take her to the range and see how she shoots and I finally got the bolt tool and piston nut wrench from the CMP e-store so we need to discuss using those tools (as well as another cool toy I got from them).

To recap what we’ve done so far:

In M1 Carbine Part 1, we took a look at the external condition of the new old CMP M1 Carbine.

In M1 Carbine Part 2, we disassembled the M1 Carbine into its major groups.

In M1 Carbine Part 3, we disassembled the Trigger Housing Assembly into its individual components.

In M1 Carbine Part 4, we disassmbled the bolt without using the M1 Carbine Bolt Tool (don’t try this at home kiddies).

In M1 Carbine Part 5, we removed the components from the stock and receiver that were necessary to remove for inspection and discussed those items not removed.

First I would like to recommend my resource for all the manufacturer information. Craig Riesch’s U.S. M1 Carbines Wartime Production should be considered a must have for anyone interested in the production history of the M1 Carbine. It even includes a handy-dandy fill-in table for documenting all of your component parts to help you compare what you have with what parts are correct for the manufacturer and production dates for your specific rifle. It was very helpful in identifying all the component parts of my rifle. All “type” numbers are as defined in Mr. Reisch’s book.

My rifle really isn’t bad for a “mix master” that spent a number of years in a foreign military. It only has three obvious post-war replacement parts:

The Rear Sight is a type III which is correct for the period of manufacture. It is marked I.R. Co which could indicate WWII manufacture, but it also stamped with the part number 7160060 which is a clear indication that this was a post war replacement.

The type IV safety is also a post war replacement. It should be marked either EI or HI if it were an original WWII Inland piece.

The final post-war replacement piece is the recoil plate. I didn’t take a close up of it because it is unmarked. It is a type III which is the correct style, but all WWII manufacture type III recoil plates bore manufacturer marks. A type III with no markings is post-war.

In addition to the three post-war replacement parts, the stock and a few of the other component parts are from manufacturers other than Inland.

The stock was very hard to identify. It is an oval cut, low wood stock, (not a pot-belly) and has no discernible ordnance markings. It does have the Italian “FAT” emblem.

There are three numbers stamped on one side and the letter “C” stamped on the other. I would imagine that these were some sort of unit markings or inventory numbers.

I could barely make out the manufacturer’s mark in the sling well. It is marked “M-U” which identifies it as an Underwood manufactured stock. It is very hard to see, I must have taken 30 pictures of it from different angles and with different lighting before I got a shot where I could actually read the letters.

The round, type III bolt is marked “EM-Q” on the lug which indicates that it was manufactured by Quality Hardware.

The type V trigger housing is marked S’G’ and was produced by the Grand Rapids Michigan located Saginaw Steering Gear Division of General Motors.

The type II trigger is marked “LT-Q” and so was manufactured by Quality Hardware.

The final non-Inland part is the type III hammer which is marked with a “B/R” inside a box indicating that it was manufactured by Rock-Ola.

The only other questionable part is the barrel band/bayonet lug. Very few M1 carbines were produced during the war with the type III barrel band that included the bayonet lug. Most of them were retrofitted with type III bands after the war. In this rifle’s case it was produced late enough in the war that it may very well have been originally produced with the type III band and the installed barrel band is correctly marked for WWII Inland production. In other words, there is a chance that the barrel band is correct, but it is not a given.

All other component parts have Inland manufacturer markings and are correct for a manufacture date around September 1944.

Anyone have any Inland parts they want to trade for other manufacturers?

Really though, I’d like to replace the post-war parts, but I’m not in the least disappointed with having some parts from other manufacturers on the rifle. I don’t expect this to ever be a collector’s piece so just having period correct WWII manufacture parts on it is authentic enough for me.

In the next episode of M1 Carbine follies, we’re going to reassemble the trigger housing group. I’m still really busy but I’m finding my motivation again so hopefully it won’t be so long between posts from here on out.

19 thoughts on “M1 Carbine Part 6: Component markings and manufacturers

  1. Pingback: M1 Carbine Part 12: The infamous sling and sling oiler | Captain of a Crew of One

  2. Pingback: M1 Carbine Part 9: Major group reassembly | Captain of a Crew of One

  3. Pingback: M1 Carbine Part 7: Trigger Housing reassembly | Captain of a Crew of One

  4. I inherited an M1 Carbine from my dad with some marking I don’t recognize. The only name on the receiver is “Alpine” On the magazine release, it has a “M” stamp and “wa” on top of it.

    Could you give me any guidance on the history of my carbine?

  5. i to have 2 stocks with the fat 82 on it and am at a loss but the wa stands for winchester arms if im not mistaken i have an all original winchester m1 and has the same markings the m i beleive is a proof mark

  6. I have a M1 Carbine marked Inland on the receiver, but with a Saginaw serial number. It also has Inland GM 8-43 on the barrel. Can anyone explain this.

  7. I have a M1 carbine with a letter I first then rest is covered by rear sight except last two letterw which are R. P. Any ideas who I mfg is?


  8. I have a M1 Carbine that has N.O.I. under the rear sight and 1032 just aft of that. I have been asking around recently and no one has yet to I.D. the manufacturer, I am inclined to think Nat. Ord. Inc, but it doesn’t match the rest of the stampings I am finding online. Thanks.

  9. That’s an Italian Armory Marking. It stands for Fabbrica Armi Terni and the number is the year it was re-arsinaled. Many of those M1 Carbines were loaned to Italy and other countries after the war. They kept them for decades but when they decided they didn’t need them any more, were required to return them to the US. Most of them went to the CMP and were sold to the public through their sales program….which is how I got mine.

    Some people don’t like those markings because they are post WWII, but I think they just add to the rich history of these great little rifles.

  10. Many parts on an M1 Carbine were made by many other companies. A correct, as built, M1 Carbine could be made by Inland with parts from other suppliers. All 10 manufacturers swapped parts as needed in order to get the guns built.

    To answer Dan’s question, RP is Rock-Ola.

    My Inland M1 Inland. Carbine has a Rock-Ola front sight. It also has a Type 3 barrel band that came from Inland. It is a mid 1944 product and yes, it could be factory correct.

    Jay Stang’s Alpine is a post WW II / Korea gun. Alpine made them in CA from 1962 to 1965. Prior to that, Alpine made them under the National Ordnance name. Alpine Sales was basically the sales division of National Ordnance until the two companies split in the fall of 1962. It is a civilian M1 carbine.

    • Your welcome, but I misread Dan’s question. RP on the front sight would be Rock-Ola. RP. under the rear sight as the last two letters would indeed be IBM CORP.

      For Don’s question on the Saginaw SG number on an Inland receiver. It might be a receiver made by Saginaw SG that got numbered by them in error. Or even a replacement unit for a defective and destroyed Saginaw SG unit but it then normally would have an X as the last mark in the serial number. Saginaw SG did make receivers for Inland at a couple points. Don should check for SI or SG marked on the left side of the receiver. Inland MFG DIV of GM was the leading maker of M1 Carbines during the war and had to use parts from many others during the war to turn out their total of 2,632,097 guns. GM made over half of all of them made during the war when you add IMD, SSG Saginaw, and SSG Grand Rapids together. Winchester may have designed them but only made a third of what Inland made.

  11. I need help with barrel markings on a Postal meter Carbine. It has an UNDERWOOD barrel, however the N is backward. The date marking is of a different font and appears to be hand stamped and not rolled. It has a normal Ordnance Bomb.I have never seen this nor can I find any reference to this, I assume error. The barrel appears to be usgi and correct to the receiver. Can you help.

  12. I recently purchased what I think is a WW II manufactured M1 carbine. It his is my first such purchase, so I am new at this. My M1 is a Standard Products rifle, serial no. shows manufactured between Oct-Dec of 1943. The barrel is an Underwood dated 11-43 and the stock is Hillerich Bradsby. It has a rearmory marked BA with post war type IV rear sight, modified Mag release and upgraded flip safety. It has an early type one barrel band. I do not know whether to restore it or leave it as is? Any thoughts?

  13. I have an M1 carbine serial numbered XB32 on the receiver. It has a barrel marking “Inland Mfg. Div.” over “General Motors” over “1/44″.

    Any ideas on the strange serial number?

  14. Nope. If I were to guess I’d say the receiver is aftermarket. The serial numbers for original receivers were pretty straightforward.

    No guarantees though…I’m no historian when it comes to this stuff…just a hobbyist. Its possiblenyou’ve got something rare there. I just don’t know.

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